likes, mention parsing, lots of stuff

Signed-off-by: William Casarin <jb55@jb55.com>

damus/Models/Liked.swift

@@ -0,0 +1,19 @@
+//
+//  Liked.swift
+//  damus
+//
+//  Created by William Casarin on 2022-04-30.
+//
+
+import Foundation
+
+struct Liked {
+    let like: NostrEvent
+    let id: String
+    let total: Int
+}
+
+struct LikeRefs {
+    let thread_id: String?
+    let like_id: String
+}